Rain Garden Rain GardenOur demonstration Rain Garden was created with support and a challenge from the Erb Family Foundation. This is first Rain Garden that Piet Oudolf has designed. We feel privileged to have it in Oudolf Garden Detroit on our Belle Isle.Planting DesignsQuick Facts Stormwater Practice Area3,803 square feetRetention Zone Equivalent Water Depth8.2 inchesRetention Zone Volume1,873 cubic feetTotal Area0.25 AcresPlant TypeVarietiesPlantsForbs201,078Grasses51,742Trees and Shrubs1589Total402,909* As of March, 2023Plant List Other Rain Garden ResourcesWashtenaw County Water Resource Commission